# Sound and light

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1. Origin of music

Define Sound
vibrations that travel through air or another medium and can be heard when they reach the ears.
2. Define sound waves in the air.
Pressure waves that move back and forth vibrations of particles of the medium through which the sound moves.
3. Define compression in sound.
Regions of high air pressures
4. Define rarefaction in sounds
Region of low air pressures
5. Define wavelengths
A distance that a disturbance travels along a medium in one complete wave cycles
6. transverse wave
the measurement of one wave crest to the next adjacent wave crest.  These are energy that is carried away from the source.
7. Longitudinal waves
repeating patterns of compression and rarefactions measured as the distance from one compression to the next adjacent compression or the distance from one rarefaction to the next adjacent rarefaction.
8. ****Speed of sound****

Define pressure waves
• repeating patterns of high and low pressure
• (compression and rarefaction)
9. What are high pressure in pressure waves?
The arrival of a compression
10. What are low pressure in pressure waves?
the arrival of a rarefaction
11. Sine curves at high pressures
at a peak on the graph is high
12. Sine curves at low pressures
at a low peak on the graph
13. what are zero points on the graph for pressure?
the pressure that the air would have
14. What are sound waves traveling through the air?
They are Longitudinal waves with compression and rarefactions
15. ****pitch and frequency****

Frequency
Frequency of a wave refers to how often the particles of the medium vibrate when a wave passes through the medium
16. Frequency of a wave
a number of complete back and forth vibrations of a particle of the medium per unit of time
17. What is the frequency of sound waves that a human can hear?
between 20 Hz and 20000 Hz
18. What is Infrasound
any sound with a frequency below audible range of hearing (less than 20Hz)
19. what is ultrasound
any sound above audible range of hearing (20000Hz)
20. ***Pitch***

Define pitch
the sensation of a frequency of sound
21. What is a high pitch sound
a high frequency sound wave
22. What is a low pitch sound
a low frequency sound wave
23. Define constant
certain sound waves that when played on an instrument, plays simultaneously and will be pleasant.
 Author: Anonymous ID: 211071 Card Set: Sound and light Updated: 2013-04-03 02:15:25 Tags: Physics Folders: Description: Sound and light Show Answers: